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| Number | Title | Issue Date |
| 8155302 | Acoustic echo canceller An acoustic echo cancellation device for canceling an echo in a microphone signal in response to first and second input signals includes a first combination unit for combining the first and second input signals into an aggregate input signal. The device further incl... | 04/10/2012 |
| 7856097 | Echo canceling apparatus, telephone set using the same, and echo canceling method Providing echo canceling apparatus, telephone set using the same and an echo canceling method that do not require transmission/reception sound detection and are resistant to environmental noise. Echo canceling apparatus according to the invention includes a c... | 12/21/2010 |
| 7734035 | Method and apparatus for soft-response echo suppression Methods and apparatus are provided for reducing echo from a received signal. A suppression gain is applied to an output of an echo canceler that has processed the received signal. The suppression gain includes a region of sloping attenuation about a decision point. ... | 06/08/2010 |
| 7711107 | Perceptual masking of residual echo A method of masking a residual echo signal by an echo canceller is provided. The method comprises receiving a far-end signal, adjusting filter coefficients of an adaptive filter in response to the far-end signal, generating an echo model signal based on the far-end ... | 05/04/2010 |
| 7450714 | Echo canceller having improved non-linear processor A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds a... | 11/11/2008 |
| 7433463 | Echo cancellation and noise reduction method A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.... | 10/07/2008 |
| 7394898 | Echo removing apparatus An echo removing apparatus for reducing the echo caused by sound returning from a speaker to a microphone of a small-sized communication terminal, such as a portable telephone. The echo removing apparatus includes a filter unit for outputting a pseudo echo signal es... | 07/01/2008 |
| 7366245 | Calibration in MIMO systems Aggregate channel reciprocity in a wireless system is supported by calibrating transmitter/receiver pairs. ... | 04/29/2008 |
| 7366118 | Echo cancellation The present invention relates to a cancellation of echoes in telecommunications systems, more specifically it relates to adaptive alignment of a linear filter (500) used for echo cancellation. According to the invention, it is continuously determined, by mean... | 04/29/2008 |
| 7352687 | Mixed domain cancellation A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals in a multi-channel environment are manipulated into a transform domain, such as the frequency domain. Thereafter, the signals may ... | 04/01/2008 |
| 7349482 | Echo canceller of ADSL system and training method thereof An echo cancellation circuit includes delay units at its input unit and output unit in order to adjust the delay caused by a FIFO. The delay times of the delay units are trained using a training signal, such the REVERB signal, that is a system initializing signal. I... | 03/25/2008 |
| 7346013 | Frequency domain equalization of communication signals A system and method for estimating a channel spectrum. The method includes: (a) receiving an input signal from a channel, where the input signal includes one or more major echoes and zero or more minor echoes introduced by the channel; (b) identifying the one or mor... | 03/18/2008 |
| 7346012 | Transceiver with accelerated echo canceller convergence A receiver for receiving an incoming signal over a communication medium includes an echo canceller, which is adapted to receive an outgoing signal transmitted over the communication medium, and to process the outgoing signal using a set of variable processing coeffi... | 03/18/2008 |
| 7333603 | System and method for adapting an analog echo canceller in a transceiver front end There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a line receiver capable of receiving analog receive signals from the cabl... | 02/19/2008 |
| 7330500 | Adjustable electronic duplexer A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna is disclosed. The duplexer comprises a first signal path between the transmission unit and the reception unit, the first signal path comprises a filter unit filte... | 02/12/2008 |
| 7327840 | Loudspeaker telephone equalization method and equalizer for loudspeaker telephone An equalizer for a loudspeaker telephone includes a signal generator for generating a reference signal for broadcast by a loudspeaker of the loudspeaker telephone. A filter alters the frequency response of signals prior to broadcast by the loudspeaker. During set-up... | 02/05/2008 |
| 7319846 | Colored interference identification A method and apparatus for receiving a communication signal r(t) subject to noise n(t) over a communication channel (10) is disclosed. The method comprises the steps of: receiving (100) the communication signal r(t) comprising the noise n(t), estimatin... | 01/15/2008 |
| 7319748 | Device and method for suppressing echo in telephones The present invention relates to a suppression device for an arrangement for the transmission of audio signals, in particular uttered speech, having: an echo reduction unit (4), which is arranged between an input channel (1) for receiving an input audi... | 01/15/2008 |
| 7317801 | Active acoustic noise reduction system An active acoustic noise reduction system which comprises a single input transducer and an output actuator that are physically located next to each other in the same location. In one embodiment, the input transducer and the output actuator are a hybrid represented b... | 01/08/2008 |
| 7305083 | Echo canceller An echo canceller used in a vocal information exchange system operates in such a circumstance that a sound wave released by a speaker is picked up by a microphone unintentionally and works to suppress an echo signal included in the audio signal produced by the micro... | 12/04/2007 |
| 7305216 | Transmitting and receiving arrangement with interference signal suppression control A transmitting and receiving arrangement is disclosed having a transmission path, a reception path, and a control device for suppression of interference signals which are produced by crosstalk from the transmission path to the reception path. The control device inpu... | 12/04/2007 |
| 7289626 | Enhancement of sound quality for computer telephony systems Techniques for enhancing the sound quality of computer telephony systems are provided. In general, digital signals including telephony sounds are converted from the time domain to the frequency domain. If noise is detected in the frequency domain conversion of the d... | 10/30/2007 |
| 7283543 | System and method for operating echo cancellers with networks having insufficient levels of echo return loss A system and method for providing an apparent echo return loss is provided. A communications network may include a gateway coupled to a local exchange network. The gateway may receive signals from a packet network and output signals to a circuit switched network, wh... | 10/16/2007 |
| 7274732 | Echo cancellation in communication systems with asymmetric data rates A communication device (e.g., a modem) is disclosed as including logic that processes a transmit signal before providing a signal to an echo canceler. The processing may include low pass filtering and decimation of the transmit signal. The low pass filter's cut-off ... | 09/25/2007 |
| 7269211 | Residual echo reduction for a full duplex transceiver A hybrid circuit within a full-duplex transceiver transmits an outgoing signal outward on a communication channel at the same time it receives an incoming signal arriving via the communication channel, and the outgoing and incoming signals sum to form a combined sig... | 09/11/2007 |
| 7260213 | Telephone echo canceller The invention relates to an echo canceling device and method for an arrangement for transmitting audio signals, in particular uttered speech with an echo filter for canceling echo. The echo filter is arranged between an input channel (1) and an output channel... | 08/21/2007 |
| 7251213 | Method for remote measurement of echo path delay A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can b... | 07/31/2007 |
| 7246059 | Method for fast dynamic estimation of background noise The invention provides a method and system for dynamically estimating background noise. The system includes a portable communication device, a vocoder, and a voice activated detector. Based on information received by the portable communication device, the vocoder de... | 07/17/2007 |
| 7243065 | Low-complexity comfort noise generator A comfort noise generator (104) suitable for use in a communication system includes a finite impulse response (FIR) filter (136), a random number generator (140), and a coefficient updater (138). The coefficient updater (138) deter... | 07/10/2007 |
| 7233896 | Regular-pulse excitation speech coder A method for providing synthesized speech using regular-pulse excitation includes a first step (300) of processing input speech to provide a residual excitation signal. A next step (302) includes defining important samples of the residual signal. Low f... | 06/19/2007 |
| 7233893 | Method and apparatus for transmitting wideband speech signals A method and an apparatus for transmitting a speech signal are provided. A speech signal transmitter includes a quadrature mirror filter, a base sub-band encoder, an enhancement sub-band encoder, and a network connector. The quadrature mirror filter receives a speec... | 06/19/2007 |
| 7231036 | Anti-howling circuit detecting howling from effect of predicted echo signal In a system in which echo transferred from a received signal to an outgoing signal is canceled by subtracting an adaptively predicted echo signal from the outgoing signal, howling is detected by detecting the effect of the predicted echo signal. The detected effect ... | 06/12/2007 |
| 7227960 | Robot and controlling method of the same An attention direction of a robot, indicated by a face, eyes or the like thereof, can be aligned with a directivity direction of a microphone array. Specifically, an acoustic signal from a sound source can be captured, and input signals for individual microphones ca... | 06/05/2007 |
| 7221755 | Method of capturing constant echo path information in a full duplex speakerphone A method of improving convergence of an echo canceller in a full duplex speakerphone, wherein the echo canceller includes LEC (Line Echo Canceller) and AEC (Acoustic Echo Canceller) portions, comprising the steps of capturing coefficients during operation, storing t... | 05/22/2007 |
| 7218730 | System and method for analysis and filtering of signals in a telecommunications network A system and method for signal analysis in a network. The method includes attempting, by a first processor, to compute optimal coefficients for filtering a signal, determining that computing the optimal coefficients exceeds the computational capabilities of the firs... | 05/15/2007 |
| 7212841 | Telephone apparatus and a communication method using such apparatus In accordance with a first aspect of the present invention there is provided a telephone apparatus including a transmitter portion and a receiver portion, an input transducer for converting input audio signals into electrical signals, a connectable input link betwee... | 05/01/2007 |
| 7203308 | Echo canceller ensuring further reduction in residual echo An echo canceller includes: an echo cancellation part canceling echo included in a near-end input signal; a noise suppression part employing a low-pass filter having a variable cut-off frequency adaptive to power of an input signal, the noise suppression part removi... | 04/10/2007 |
| 7200222 | Echo canceller employing dual-H architecture having variable adaptive gain settings An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to simulate an echo response occurring during the ... | 04/03/2007 |
| 7200221 | Methods and systems for providing multi-path echo cancellation Providing multi-path echo cancellation comprises providing a main echo signal corresponding to a main echo section of an echo response and providing a plurality of tail echo signals, each of the plurality of tail echo signals corresponding to respective tail echo se... | 04/03/2007 |
| 7187656 | Method and system for processing tones to reduce false detection of fax and modem communications A tone processing method and communications system which reduce the probability of falsely detecting modem and facsimile communications that occur on a communications link. The link connects a calling endpoint to an answering endpoint. In a preferred embodiment, whe... | 03/06/2007 |
